Cap wrench



FIG. 1 is a side and front perspective view of a cap wrench, showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side plan view thereof, taken from the right of FIG. 1; and,

FIG. 4 is a side plan view thereof, taken from the right of FIG. 2. 

The ornamental design for a cap wrench, as shown and described. 